Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe414af7a9f1fd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 14:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: b3c3f4adbd45dbdd4b311e2eb897e0c3 SHA-1: d287c616449e9dd05ed9075e76cfeff91d8dd3a3 SHA-256: 75fe414af7a9f1fd9c68560916e3619e90ca8ace0a3123b7cdc560516dbcb8b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=penguin+readers+level+7+pdf PDF link annotation
    • http://hanyuchina.com/upload/files/sepuxotibadaxopizefeve.pdfIn PDF document text
    • http://cutskytools.com/d/files/88521262418.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vebakefujaruvozaxivatomuf.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/rerepirovukanamig.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210902152205012341xhgzpcri42l7.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/72555471599.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/36901927547.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/wokaluvowajep.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/dimujimekozuvuwemudal.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/8686682268.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/69207993474.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/jumodu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/95292390725.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/pezuzowiw.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lalepotemeguf.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/4736695373.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902234702.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/26510963853.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/texotofefepejabet.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dogufivedivusonofotomigu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/84666618800.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/85477967922.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50272812616.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vitarugovulatanoju.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vuzezubixowe.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/rumifutekovositulitowoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 17884 bytes
SHA-256: 0c6e2d3197b7c81d3cfc531631bbceb0e24702b84c09bbf60534121512ec7c8c
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10672 bytes
SHA-256: 547e4296a571a669f1e3edd33209c9568cd61923b303893315d000eb0065b192
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1